Add ESLint (#941) ...

* Add eslint, switch to lint-staged for precommit

* Fix all ESLint errors

* Update GH workflow to check prettier and eslint

Dev/post refactor fixes (#927) ...

* Re-introduce outgoing message logging

Signed-off-by: TheArcaneBrony <myrainbowdash949@gmail.com>

* Websocket dumping

* Sentry user count on API

* Generate session ID upon opening websocket, fix gateway dumps

* Async file io in src/gateway/events/Message.ts

Signed-off-by: TheArcaneBrony <myrainbowdash949@gmail.com>

* Async file io in src/util/util/Config.ts

Signed-off-by: TheArcaneBrony <myrainbowdash949@gmail.com>

* Make pre-commit hook executable

Signed-off-by: TheArcaneBrony <myrainbowdash949@gmail.com>

* Fixed sync file io in src/util/util/Config.ts

Signed-off-by: TheArcaneBrony <myrainbowdash949@gmail.com>

* Fixed missing await call in src/util/util/AutoUpdate.ts

Signed-off-by: TheArcaneBrony <myrainbowdash949@gmail.com>

* Add comment to src/gateway/events/Connection.ts

Signed-off-by: TheArcaneBrony <myrainbowdash949@gmail.com>

* Clean up gateway dumping code

Signed-off-by: TheArcaneBrony <myrainbowdash949@gmail.com>
Co-authored-by: Madeline <46743919+MaddyUnderStars@users.noreply.github.com>

Prettier precommit hook